National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

78°F

26°C

Humidity 76%
Wind Speed S 5 mph
Barometer 30.03 in (1016.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 22 Aug 2:56 am CDT
Extended Forecast for

Lockhart TX

Heat Advisory August 22, 03:11am until August 23, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 22, 03:11am until August 23, 07:00pm

    NOW until 7:00pm Sun

    Heat Advisory

  • Overnight

    Low: 76 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 104. Heat index values as high as 107. South southwest wind around 5 mph becoming southeast in the afternoon.

    High: 104 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny and hot, with a high near 104. South southeast wind around 5 mph.

    High: 104 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 103. Southwest wind 5 to 10 mph.

    High: 103 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 103. South southwest wind around 5 mph.

    High: 103 °F

    Hot

Detailed Forecast

Overnight
Mostly cloudy, with a low around 76. South southwest wind around 5 mph.
Saturday
Mostly sunny and hot, with a high near 104. Heat index values as high as 107. South southwest wind around 5 mph becoming southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph.
Sunday
Sunny and hot, with a high near 104. South southeast wind around 5 mph.
Sunday Night
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny and hot, with a high near 103. Southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 76. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 103. South southwest wind around 5 mph.
Tuesday Night
Clear, with a low around 76. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Sunny and hot, with a high near 104.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny and hot, with a high near 104.
Thursday Night
Mostly clear, with a low around 76.
Friday
Sunny and hot, with a high near 102.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
2:46 am CDT Aug 22, 2026
Forecast Valid:
3am CDT Aug 22, 2026-6pm CDT Aug 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation